Abstract: The present disclosure is directed to one or more embodiments of mailer package assemblies including a fixed release liner and a mailer package. The fixed release liner is removably or detachably coupled to the mailer package by an adhesive layer. The fixed release liner includes one or more wickets (e.g., openings) such that the fixed release liner may be mounted to a wall by inserting fasteners (e.g., tack(s), pin(s), etc.) into the openings. The mailer package may be removed, detached, or decoupled from the fixed release liner by pulling on the mailer package decoupling the fixed release liner from the mailer package. After the mailer package is removed, an packaging associate may place an item or product within the mailer package to be shipped to a consumer. After the mailer package is removed from the fixed release liner, the fixed release liner remains mounted to the wall.